判断题
函数sinz的周期为2kπ。()
【参考答案】
正确
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设f(x)=x²+iy²,则f(1+i)=3。()
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曲线y=f(x)在点(x0,f(x0))有拐点,且f''(x0)存在,则f''(x0)=1。()
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